Allozymic variation in the clam genus Eurhomalea (Bivalvia: Veneriidae) along southern South American coast

The correspondence between allozymic variation and specific differentiation was studied in four populations corresponding to the three nominal, allopatric species of clam genus Eurhomalea (E. rufa, E. lenticularis, E. exalbida) described for southern South America. Allozyme variation scored in 12 lo...

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Autores principales:	GALLARDO,M.H, GONZÁLEZ,C, MENA,C, LOMOVASKY,B, MORRICONI,E, CLASING,E
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2003
Materias:	allozymic variation genetic structure taxonomic status
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300013
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spelling	oai:scielo:S0716-078X20030003000132003-12-17Allozymic variation in the clam genus Eurhomalea (Bivalvia: Veneriidae) along southern South American coastGALLARDO,M.HGONZÁLEZ,CMENA,CLOMOVASKY,BMORRICONI,ECLASING,E allozymic variation genetic structure taxonomic status The correspondence between allozymic variation and specific differentiation was studied in four populations corresponding to the three nominal, allopatric species of clam genus Eurhomalea (E. rufa, E. lenticularis, E. exalbida) described for southern South America. Allozyme variation scored in 12 loci was high as indicated by heterozygosity levels (15.8-20.7 %) and by the presence of only three monomorphic loci (Hk-2, Icd-2, and Xdh-1). These high estimates of allelic variability were influenced by the low levels of interspecific genetic similarity (I = 0.64) and for the high conspecific values of genetic identity observed. The high estimates of substructuring found at the species level (F ST = 0.39) contrasted with the low differentiation (F ST = 0.027) and high migration rate (Nm = 9) existing among conspecific samples. Diagnostic allele fixation coinciding with specific recognition was recorded at locus Hk-1 whereas nearly-fixed differences at loci (Adh, alpha-Gpd, Icd-1, Ldh, Odh, Pgm-3) differed sharply in frequency among species. The Wagner procedure and the neighbor-joining algorithm produced a similar tree topology highly related to the geographic distance and to their taxonomic recognition. The lack of coincidence between patterns of allozymic variation and the two distinctive shell morphs (flat and globoid) occurring in E. exalbida from Ushuaia bay do not support their taxonomic recognition.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.76 n.3 20032003-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300013en10.4067/S0716-078X2003000300013
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	allozymic variation genetic structure taxonomic status
spellingShingle	allozymic variation genetic structure taxonomic status GALLARDO,M.H GONZÁLEZ,C MENA,C LOMOVASKY,B MORRICONI,E CLASING,E Allozymic variation in the clam genus Eurhomalea (Bivalvia: Veneriidae) along southern South American coast
description	The correspondence between allozymic variation and specific differentiation was studied in four populations corresponding to the three nominal, allopatric species of clam genus Eurhomalea (E. rufa, E. lenticularis, E. exalbida) described for southern South America. Allozyme variation scored in 12 loci was high as indicated by heterozygosity levels (15.8-20.7 %) and by the presence of only three monomorphic loci (Hk-2, Icd-2, and Xdh-1). These high estimates of allelic variability were influenced by the low levels of interspecific genetic similarity (I = 0.64) and for the high conspecific values of genetic identity observed. The high estimates of substructuring found at the species level (F ST = 0.39) contrasted with the low differentiation (F ST = 0.027) and high migration rate (Nm = 9) existing among conspecific samples. Diagnostic allele fixation coinciding with specific recognition was recorded at locus Hk-1 whereas nearly-fixed differences at loci (Adh, alpha-Gpd, Icd-1, Ldh, Odh, Pgm-3) differed sharply in frequency among species. The Wagner procedure and the neighbor-joining algorithm produced a similar tree topology highly related to the geographic distance and to their taxonomic recognition. The lack of coincidence between patterns of allozymic variation and the two distinctive shell morphs (flat and globoid) occurring in E. exalbida from Ushuaia bay do not support their taxonomic recognition.
author	GALLARDO,M.H GONZÁLEZ,C MENA,C LOMOVASKY,B MORRICONI,E CLASING,E
author_facet	GALLARDO,M.H GONZÁLEZ,C MENA,C LOMOVASKY,B MORRICONI,E CLASING,E
author_sort	GALLARDO,M.H
title	Allozymic variation in the clam genus Eurhomalea (Bivalvia: Veneriidae) along southern South American coast
title_short	Allozymic variation in the clam genus Eurhomalea (Bivalvia: Veneriidae) along southern South American coast
title_full	Allozymic variation in the clam genus Eurhomalea (Bivalvia: Veneriidae) along southern South American coast
title_fullStr	Allozymic variation in the clam genus Eurhomalea (Bivalvia: Veneriidae) along southern South American coast
title_full_unstemmed	Allozymic variation in the clam genus Eurhomalea (Bivalvia: Veneriidae) along southern South American coast
title_sort	allozymic variation in the clam genus eurhomalea (bivalvia: veneriidae) along southern south american coast
publisher	Sociedad de Biología de Chile
publishDate	2003
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300013
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Allozymic variation in the clam genus Eurhomalea (Bivalvia: Veneriidae) along southern South American coast

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